IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
|
출원번호 |
US-0581500
(1984-02-17)
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발명자
/ 주소 |
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인용정보 |
피인용 횟수 :
11 인용 특허 :
2 |
초록
▼
A reciprocating electric motor-pump assembly for lifting well fluid on downstroke of the motor pump assembly, the pump including a barrel below the motor having dual combined inlet and outlet valve means at the lower end thereof, the pump piston moving in the barrel having annular grooves therearoun
A reciprocating electric motor-pump assembly for lifting well fluid on downstroke of the motor pump assembly, the pump including a barrel below the motor having dual combined inlet and outlet valve means at the lower end thereof, the pump piston moving in the barrel having annular grooves therearound to prevent differential pressure sticking, the electric cable supplying the electric motor being tubular to vent the pump and prevent vacuum or gas lock, there being a packer about the valve barrel separating the outlet valve means thereabove from the inlet valve means therebelow and a packer above the motor about a production tubing including an upper standing valve.
대표청구항
▼
1. Apparatus comprising: a motor pump assembly including a reciprocating motor having a stator and a mover and a pump having a barrel and an imperforate plunger, said barrel being connected to said stator, said mover being connected to said plunger, said stator and mover including electromagnet m
1. Apparatus comprising: a motor pump assembly including a reciprocating motor having a stator and a mover and a pump having a barrel and an imperforate plunger, said barrel being connected to said stator, said mover being connected to said plunger, said stator and mover including electromagnet means cooperable with gravity on the down stroke of the plunger to expel fluid from the pump barrel below the plunger and elevate the fluid when the pump is suitably positioned in a wellbore, said plunger being mounted for reciprocation within said barrel, said pump including valve means connected to the lower end of the barrel, said valve means including inlet check valve means to admit fluid to the barrel and outlet check valve means to allow fluid to exit the barrel, said motor pump assembly being mounted within a well, said well including a casing coaxial with the motor and pump, a tailpipe connected to the inlet valve means, there being a fluid passage between the casing and the motor pump assembly, and a packer around the tailpipe sealing between the casing and tailpipe, said outlet valve means communicating the interior of the barrel below the plunger with the interior of the casing exterior to the motor pump assembly on the side of the packer opposite from the tailpipe, the barrel having a single longitudinally extending wall and the exterior of the barrel being at all times in open communication with the interior of the casing above the packer, said apparatus including a string of tubing inside said casing at the end of said motor pump assembly opposite from said tailpipe, a second packer around said tubing string sealing between the tubing string and casing, and a standing check valve connected to said tubing string below said second packer to admit fluid from the annulus to the tubing string. 2. Apparatus according to claim 1, including a tubular electric conductor cable connected to said motor, said cable including electric conductive means having an axial fluid passage centrally along the length thereof providing means for venting said pump via the cable. 3. Apparatus according to claim 1, and fluid passage means between said barrel and plunger extending therearound to equalize pressure around the plunger and thereby prevent pressure differential wall sticking. 4. Apparatus according to claim 1, said valve means comprising: a tubular body having an inlet axially thereof at one end connected to said tailpipe and a plurality of outlets in the sides of the body, each outlet including a portion extending radially from the interior thereof to the exterior thereof, said inlet ball check valve means being disposed in the inlet preventing flow therethrough out of the body, and said outlet check valve means being outlet ball check valve means disposed in each outlet preventing flow therethrough into the body, said radially extending portions of the outlets all connecting to the interior of the tubular body above said inlet. 5. Apparatus according to claim 4, said body including for each outlet at the downstream end of the radial portion thereof a portion extending away from the inlet parallel to the axis of the tubular body, said outlet ball check valve means being disposed in the last said portions, said body including a one-piece tubular main section including said radially extending portions of the outlets, said portions extending parallel to the axis of the tubular body including separate tubular means threadingly connected to said main section, said outlet ball check valve means being included in said tubular means, said inlet being formed in a separate tubular outlet means threadingly connected to said tubular main sections at one end thereof, said tubular main section being interiorly threaded at said one end to receive said outlet means, inlet ball check valve means being included in said separate tubular outlet means, said tubular main section being interiorly threaded to receive said tubular outlet means, the end of said tubular main section opposite from said inlet being interiorly threaded to receive said barrel of said pump, the exterior of said tubular main section being threaded for coupling to said tail pipe.
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